As far as I know V-ray does not give you an option to set another value. If you just alter the dpi value you will see that the width and heigh values in inches (mm or pt depending on your setup) are automatically adjusted accordingly.ħ2dpi is an old default used back in the days where most computerscreens were crt and had about 72 pixles per inch in physical size, and this default is added to an image when saved when no setting is applied from the application. In photoshop you can alter the dpi value and choose to resize the actual pixles, or just alter the dpi value without resizing the actual image. A rendered image is only pixles, so to print the image the computer needs to know how big those are going to be on the paper, that is where dpi comes in, how many dots (pixles) are going to be used per printed inch.
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